A Critique of the Layer-Cake Approach to the Trinidad Stratigraphy - Dr. H. Vincent
Professionals and students using the Trinidad Stratigraphic Table must place the layer-cake
correlation principles, upon which it was largely developed, in context. The layer-cake approach assumes a lateral
continuation and regional homogeneity of stratigraphic horizons (biostratigraphic and lithological). This assumption
transcends to the finer-scale intra-formation applications such as correlation of individual sands.
Examples are given from the Trinidad stratigraphy that highlight this layer-cake approach to correlations. The
validity of this approach is questioned given the current knowledge of sedimentary processes, depositional systems
and stratigraphic correlation techniques, which all suggest greater heterogeneity and complexity than usually assumed.
Only when "significant" stratigraphic horizons (and formations) are placed within their depositional
context, can we begin to question their importance, as some can be very localized and/ or discontinuous and not
deserving of formal stratigraphic recognition. Similarly, at the level of individual sands, depositional systems
are too varied and complex to assume homogeneity and lateral continuity.
Some suggestions are made for the structure of the Trinidad Stratigraphic Table while for hydrocarbon exploitation,
it is arguable whether past and current reservoir management practices have efficiently utilized the advances made
in the fields of sedimentology and stratigraphy. One can appreciate that modern, large-scale stratigraphic correlations
will have the greatest impact on exploration-type projects while finer-scale correlations would be important for
secondary recovery schemes within a mature hydrocarbon province.
BIO
Hasley Vincent holds a BSc. degree in Geology from the University of the West Indies, Jamaica and a MSc. Degree
in Petroleum Geoscience from Imperial College, London. He recently completed PhD. studies on the Trinidad Cenozoic
at Dalhousie University, Canada. He is currently employed as a Geologist at the Ministry of Energy and Energy
Industries, prior to which, has held posts in Halliburton and Petrotrin.
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